I was a flying instructor at the time that I read "Chicken Hawks".
I had had instructors myself whose normal instructional patter was along the lines of "Get the f**** power in you ###!" or almost as bad, the casual drawled "In your own time, you might like to get the collective down - save us dying today". Sarcasm and understatement; one as bad as the other in the learning process.
I was not going to use either of those approaches, as I could see that it simply made students either fearful or unthinking robots, motivated only by the snarl of the instructor's voice.
Instead I used the word "must" instead of shouted abuse or silky disdain. This was a very successful term which gave confidence and clear instruction to the student.
Back to the thread! I was cheered to see that Mason as an instructor, apparently used "must" in his briefings and patter, for I imagine the same reasons as me. :
Notwithstanding his later drug problems, he had been a thinking and sympathetic Instructor Pilot in his better days.
thekite